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question asked: Dec 09 '09, 1:23 a.m.
question was seen: 4,487 times
last updated: Dec 09 '09, 1:23 a.m.

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How to estimate the database resources needs?

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Peter Haumer (2.2k●1●20●19) | asked Dec 09 '09, 1:23 a.m.
JAZZ DEVELOPER
Hello.
I am setting up vmware image with four Jazz-based products (all CALM
products plus a Jazz Foundation-based product). We are required for some
"other" reason to run our databases in DB2 and not Derby.

Hence, I was wondering how I can minimize the hard-disk usage of DB2. As
this will not be a production environment, but a demo machine I would like
to find a heuristic for calculation how large a tablespace I really need.
Is there any guidance available for that?

If I do not do anything then a lot of space is used. The default db2
teamserver properties files allocate 250000 pages in the tablespace. The
comments talk about a 4k page size and 1GB, but the online help actually
tells you to create a DB with 8k pages, which takes 2GB of space.

Which size do I need for which product? How can I decide what the right
amount of pages I need for my demo data?

Any tips and practical experience reports would be appreciated.
Peter.

P.S.: on a related note I was wondering how I can reduce the memory
footprint of running the four apps in parallel. Would running four tomcat
servers use more or less memory than installing Websphere and running all
apps there? Is multi-war provisioning
(https://jazz.net/wiki/bin/view/Main/InstallingMultipleJazzWARs) supported
with all 2.x products? Anyone experience and more detailed instructions for
configuring CALM apps on one tomcat?

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Ralph Schoon (63.1k●3●36●46) | answered Dec 14 '09, 7:13 a.m.
FORUM ADMINISTRATOR / FORUM MODERATOR / JAZZ DEVELOPER
Hi Peter,

with respect to the multi war provisioning. I tried that with RTC 2.0 and RQM 2.0 and it did not work. I haven't had the time to retry. I'd try again with RTC 2.0.0.2 once it is GA'd.

Ralph

Hello.
I am setting up vmware image with four Jazz-based products (all CALM
products plus a Jazz Foundation-based product). We are required for some
"other" reason to run our databases in DB2 and not Derby.

Hence, I was wondering how I can minimize the hard-disk usage of DB2. As
this will not be a production environment, but a demo machine I would like
to find a heuristic for calculation how large a tablespace I really need.
Is there any guidance available for that?

If I do not do anything then a lot of space is used. The default db2
teamserver properties files allocate 250000 pages in the tablespace. The
comments talk about a 4k page size and 1GB, but the online help actually
tells you to create a DB with 8k pages, which takes 2GB of space.

Which size do I need for which product? How can I decide what the right
amount of pages I need for my demo data?

Any tips and practical experience reports would be appreciated.
Peter.

P.S.: on a related note I was wondering how I can reduce the memory
footprint of running the four apps in parallel. Would running four tomcat
servers use more or less memory than installing Websphere and running all
apps there? Is multi-war provisioning
(https://jazz.net/wiki/bin/view/Main/InstallingMultipleJazzWARs) supported
with all 2.x products? Anyone experience and more detailed instructions for
configuring CALM apps on one tomcat?

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